... A709Gr50 A633D S275JO S355JO 12Cr1MoV 15CrMo low alloy steel plate Q345,Q390,Q420,Q460GB/T1591Makes mechanical device and other structural elements like drilling ... ,St50-2DIN17100St60-2,St70-2DIN17100StE315,StE355,StE380BS4360StE420,StE460,StE500,StE520 A572(Gr42,50,55,60,65), ISO4950-2S275(JR,J0,J2 ... ) S355JR A572Gr50 St52-3 A709Gr50 A633D S275JO S355JO 12Cr1MoV 15CrMo low alloy steel plate